Get information from a form

31st May 2016
iText PDF

This example was written in answer to the question How to check a check box?

CheckBoxValues.java
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
/**
 * Example written by Bruno Lowagie in answer to:
 * http://stackoverflow.com/questions/19698771/checking-off-pdf-checkbox-with-itextsharp
 * <p>
 * Given a check box in a form, how do we know which values to use in setField?
 */
package com.itextpdf.samples.sandbox.acroforms;
 
import com.itextpdf.forms.PdfAcroForm;
import com.itextpdf.forms.fields.PdfFormField;
import com.itextpdf.kernel.pdf.PdfDocument;
import com.itextpdf.kernel.pdf.PdfReader;
import com.itextpdf.test.annotations.type.SampleTest;
import org.junit.Assert;
import org.junit.BeforeClass;
import org.junit.Test;
import org.junit.experimental.categories.Category;
 
import java.util.Map;
 
@Category(SampleTest.class)
public class CheckBoxValues {
    public static final String CMP = "Off\nYes\n";
    public static final String DEST = "./target/test/resources/sandbox/acroforms/check_box_values.pdf";
    public static final String FIELD = "CP_1";
    public static final String SRC = "./src/test/resources/pdfs/datasheet.pdf";
 
    @BeforeClass
    public static void beforeClass() throws Exception {
        new CheckBoxValues().manipulatePdf();
    }
 
    @Test
    public void manipulatePdf() throws Exception {
        PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC));
        PdfAcroForm form = PdfAcroForm.getAcroForm(pdfDoc, true);
 
        Map<String, PdfFormField> fields = form.getFormFields();
        PdfFormField field = fields.get(FIELD);
 
        StringBuilder sb = new StringBuilder();
        String[] states = field.getAppearanceStates();
        for (String state : states) {
            sb.append(state);
            sb.append('\n');
        }
        System.out.println(sb);
 
        pdfDoc.close();
 
        Assert.assertEquals(CMP, sb.toString());
    }
}

Resources

CheckBoxValues.cs
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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2019 iText Group NV
    Authors: iText Software.
 
    For more information, please contact iText Software at this address:
    sales@itextpdf.com
 */
 
using System;
using System.Collections.Generic;
using System.IO;
using iText.Forms;
using iText.Forms.Fields;
using iText.Kernel.Pdf;
 
namespace iText.Samples.Sandbox.Acroforms
{
    public class CheckBoxValues
    {
        public static readonly String DEST = "../../results/sandbox/acroforms/check_box_values.pdf";
 
        public static readonly String SRC = "../../resources/pdfs/checkboxExample.pdf";
 
        public static readonly String CHECKED_FIELD_NAME = "checked";
        public static readonly String UNCHECKED_FIELD_NAME = "unchecked";
 
        public static readonly String CHECKED_STATE_VALUE = "Yes";
        public static readonly String UNCHECKED_STATE_VALUE = "Off";
 
        public static void Main(String[] args)
        {
            FileInfo file = new FileInfo(DEST);
            file.Directory.Create();
 
            new CheckBoxValues().ManipulatePdf(DEST);
        }
 
        public void ManipulatePdf(String dest)
        {
            PdfDocument pdfDoc = new PdfDocument(new PdfReader(SRC), new PdfWriter(dest));
            PdfAcroForm form = PdfAcroForm.GetAcroForm(pdfDoc, true);
            IDictionary<String, PdfFormField> fields = form.GetFormFields();
            PdfFormField checkedField = fields[CHECKED_FIELD_NAME];
            PdfFormField uncheckedField = fields[UNCHECKED_FIELD_NAME];
 
            // Get array of possible values of the checkbox
            String[] states = checkedField.GetAppearanceStates();
 
            // See all possible values in the console
            foreach (String state in states)
            {
                Console.Write(state + "; ");
            }
 
            // Search and set checked state to the previously unchecked checkbox and vice versa
            foreach (String state in states)
            {
                if (state.Equals(CHECKED_STATE_VALUE))
                {
                    uncheckedField.SetValue(state);
                }
                else if (state.Equals(UNCHECKED_STATE_VALUE))
                {
                    checkedField.SetValue(state);
                }
            }
 
            pdfDoc.Close();
        }
    }
}

Click the following link to see the legacy example for iText 5. Except for security fixes, iText 5 is no longer being developed.



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